We demonstrate that using a broadband, first order, and coherent pump laser enables effective and efficient forward-pumped distributed Raman amplification for long-haul transmission systems, thanks to the simultaneous suppression of ASE noise and RIN-related penalty. We show in both experiments and simulation that this scheme extends the reach of 10 × 120 Gb/s DP-QPSK WDM transmission by a minimum of 50%, compared with low RIN Bi-doped fibre laser and other commercially available pump lasers. Moreover, it requires very low forward pump power, and maintains uniform/symmetric signal power distribution which allows effective nonlinearity compensation.
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Funding: UK EPSRC Programme Grant EP/J017582/1 and EP/L000091/1(UNLOC and PEACE), FP7 ITN programme ICONE (608099), MSCA IF grant SIMFREE (748767)
- Optical fibre communication
- optical amplifiers